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Zerfallende Quadrikenschnitte und stereographische Projektion

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Abstract

If the intersection of two quadrics Q n−11 , Q n−12 in projective space Pn contains a quadric Q n−23 which is different from its singularity space, then the intersection Q n−11 ∩ Q n−12 is the union of two quadrics Q n−23 , Q n−24 . This theorem leads to a geometric characterization of those hyperquadrics of a hyperplane π of Pn that are images of quadrics on a given quadric Qn−1 by a given stereographic projection of Qn−1 onto π.

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Herrn Prof. Dr.Oswald Giering zum 50. Geburtstag gewidmet

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Hartl, J. Zerfallende Quadrikenschnitte und stereographische Projektion. J Geom 22, 149–152 (1984). https://doi.org/10.1007/BF01222838

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  • DOI: https://doi.org/10.1007/BF01222838

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